10. Gastrochama Tasmanica, T. Woods, a, Eight valve ; and 



b, dorsal aspect of united valves ; enlarged. 



11. Lepton ovatuui, Tate. Left valve, much enlarged. 



12. Pythina Tasmanica, Tenison Woods. Left valve, enlarged. 



13. Helix Tomsetti, Tate, a, Front view ; i^basal aspect; and 



c, view from above ; nat. size. 



14. Helix reteporoides, Tate, a, Front view; b, basal aspect; 



and c, view from above ; enlarged. 



15. Dosinia grata, Deshayes. Right valve, nat. size. 



16. Modiola semivestita, Dunker. a, Left valve, and b, dor- 



sal aspect of united valves ; nat. size. 



